R2：底板 / 刀片布局布线脚本、快照、截图与规划文档更新（含外壳、打印件、布线归档）

Co-Authored-By: Claude Opus 5.5 <[email protected]>

.claude/r2/_d16_reach.out.json

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+{"SDA6": [{"pad": "U35.15", "starts": 51, "cells": 90125, "box": [0.88, 46.88, 72.62, 85.12], "border": [[2, "GND", 5016], [1, "GND", 3768], [2, "+3V3", 2122], [1, "+12V", 1392], [2, "FAN_TACH_IN", 1369], [1, "+5V", 1269], [2, "FAN_TACH_OUT", 1258], [1, "+3V3", 1249], [2, "SCL", 980], [2, "EFUSE_EN2", 968], [2, "FAN_PWM", 884], [2, "+5V", 816]]}, {"pad": "U36.3", "starts": 105, "cells": 377602, "box": [0.88, 0.88, 97.12, 97.12], "border": [[2, "GND", 27640], [1, "GND", 22260], [2, "#edge", 7657], [1, "#edge", 6101], [2, "NTC2", 4010], [1, "NTC2", 2923], [2, "PRSNT5#", 2704], [1, "+12V", 2607], [2, "VDAC4", 2441], [1, "+3V3", 1977], [1, "VDAC1", 1832], [1, "+5V", 1782]]}, {"meet": false}], "SCL6": [{"pad": "U35.16", "starts": 69, "cells": 90137, "box": [0.88, 46.88, 72.62, 85.12], "border": [[2, "GND", 5016], [1, "GND", 3768], [2, "+3V3", 2122], [1, "+12V", 1392], [2, "FAN_TACH_IN", 1369], [1, "+5V", 1269], [2, "FAN_TACH_OUT", 1258], [1, "+3V3", 1249], [2, "SCL", 980], [2, "EFUSE_EN2", 968], [2, "FAN_PWM", 884], [2, "+5V", 816]]}, {"pad": "U36.2", "starts": 115, "cells": 377606, "box": [0.88, 0.88, 97.12, 97.12], "border": [[2, "GND", 27641], [1, "GND", 22260], [2, "#edge", 7657], [1, "#edge", 6101], [2, "NTC2", 4010], [1, "NTC2", 2923], [2, "PRSNT5#", 2704], [1, "+12V", 2607], [2, "VDAC4", 2441], [1, "+3V3", 1977], [1, "VDAC1", 1832], [1, "+5V", 1782]]}, {"meet": false}]}